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PREVENTION OF 
PREECLAMPSIA 
ROLE OF ASPIRIN AND CALCIUM 
Dr Kanddy 
O&G Updates 
Miri Hospital 
1/11/14
DEFINITIONS 
• Chronic hypertension 
• Hypertension (BP ≫ 
140 
90 
mmHg; 4 – 6 hours apart); < 20 weeks of gestation 
• Gestational hypertension 
• Hypertension (BP ≫ 
140 
90 
mmHg; 4 – 6 hours apart); > 20 weeks of gestation 
• Without significant proteinuria 
• Pre – eclampsia 
• Hypertension (BP ≫ 
140 
90 
mmHg; 4 – 6 hours apart); > 20 weeks of gestation 
• With significant proteinuria – urine dipstick 2+ or more; or 24 hours urine protein 
300 mg per day or more
• Eclampsia 
• Seizure associated with pre-eclampsia 
• Chronic hypertension with superimposed pre-eclampsia 
• Unclassified hypertension 
• Hypertension (BP ≫ 
140 
90 
mmHg; 4 – 6 hours apart); > 20 weeks of gestation but no 
BP record prior to that 
Based on ISSHP 2001 (International Society for Study of Hypertension in 
Pregnancy)
PATHOPHYSIOLOGY 
• Unknown
BURDEN OF PRE-ECLAMPSIA 
• One of the major cause of 
maternal mortality
MATERNAL MORTALITY - MALAYSIA
• Fetal/neonatal morbidity/mortality 
• 1 in 20 (5%) stillbirths occurred in women with pre-eclampsia 
• 8 – 10% of all preterm birth result from hypertensive disorders 
• Small for gestational age
REDUCING THE RISK OF HYPERTENSIVE 
DISORDERS IN PREGNANCY 
• Pre-existing risk factors 
• Modifiable 
• Obesity 
• Non-modifiable 
• Medical illnesses 
• Age 
• Primiparity 
• Family history
ANTIPLATELET AGENTS 
• Rational 
• Pre-eclampsia is associated with deficient intravascular production of 
prostacyclin (a vasodilator) and excessive production of thromboxane – a 
vasoconstrictor and stimulant of platelet aggregation 
• Antiplatelet agents – might prevent or delay development of pre-eclampsia 
• Evidence 
• Before CLASP TRIAL 
• Small trials of antiplatelet therapy 
• Reduction of about three-quarters in the incidence of PE 
• Some avoidance of IUGR
CLASP TRIAL
• Multicentre study 
• 9364 women – randomly assigned 60 mg aspirin or matching placebo 
• 74% entered for prophylaxis of pre-eclampsia 
• 12% for prophylaxis of IUGR 
• 3% for treatment of IUGR 
• Results 
• Use of aspirin was associated with a reduction of only 12% in the incidence of 
proteinuric pre-eclampsia (not significant) 
• No significant effect on the incidence of IUGR or stillbirth and neonatal death 
• Significantly reduce the likelihood of premature delivery (19.7% vs 22,2%; 
p=0.004)
• Was not associated with a significant increase in placental haemorrhages or 
bleeding during epidural anaesthesia 
• Safe for the fetus and newborn infant 
• Conclusion 
• Do not support routine prophylactic or therapeutic administration of antiplatelet 
therapy in pregnancy to all women at increased risk of pre-eclampsia or IUGR 
• May be justified in women judged to be especially liable to early onset PE severe 
enough to need very preterm delivery
• All randomised trials comparing antiplatelet agents with either placebo or no 
antiplatelet agent were included 
• To assess the effectiveness and safety of antiplatelet agents for women at 
risk of developing pre-eclampsia 
• Participants were pregnant women at risk of developing pre-eclampsia 
• Results 
• 59 trials (37,560 women) included 
• 17% reduction in the risk of pre-eclampsia associated with the use of antiplatelet 
agents; RR 0.83; NNT 72 
Duley L, Henderson-Smart DJ, Meher S, King JF. Antiplatelet agents for preventing pre-eclampsia 
and its complications. Cochrane Database of Systemic Reviews 2007.
• Significant increase in the absolute risk reduction of pre-elampsia for high risk 
compared with moderate risk women 
• 8% reduction in relative risk of preterm birth; NNT 72 
• 14% reduction in fetal or neonatal death 
• 10% reduction in small-for-gestational age babies 
• Conclusion 
• Antiplatelet agents have moderate benefits when used for prevention of pre-eclampsia 
and its consequences 
Duley L, Henderson-Smart DJ, Meher S, King JF. Antiplatelet agents for preventing pre-eclampsia 
and its complications. Cochrane Database of Systemic Reviews 2007.
RECOMMENDATION 
• Advice women at high of pre-eclampsia to take 75 mg of aspirin daily from 
12 weeks until birth of baby 
• High risk factors (any one of the following) 
• Hypertensive disease during a previous pregnancy 
• Chronic kidney disease 
• Autoimmune disease such as SLE or antiphospholipid syndrome 
• Type 1 or 2 DM 
• Chronic hypertension 
NICE Clinical Guideline; Hypertension in Pregnancy; August 2010 (revised reprint January 
2011)
• Moderate risk (more than one of the following) 
• First pregnancy 
• Age 40 year-old 
• Pregnancy interval of more than 10 years 
• BMI of 35 or more at first visit 
• Family history of pre-eclampsia 
• Multiple pregnancy 
NICE Clinical Guideline; Hypertension in Pregnancy; August 2010 (revised reprint January 
2011)
ROLE OF CALCIUM
• To assess the effects of calcium supplementation during pregnancy on 
hypertensive disorders of pregnancy and related maternal and child 
outcomes 
• Randomised trials comparing at least 1 g daily of calcium during pregnancy 
with placebos 
• Results 
• 13 studies; 15730 women 
• The average risk of high blood pressure was reduced with calcium 
supplementation (RR 0.65) 
• Reduction in the average risk of pre-eclampsia associated with calcium (RR 0.45)
• Effect was greatest for women with low baseline calcium intake (RR 0.36) and 
those high risk 
• Risk of preterm birth reduced (RR 0.76) 
• Composite outcome maternal death or serious morbidity was reduced (RR 0.80) 
• No overall effect on the risk of stillbirth or death 
• Anomalous increase in the risk of HELLP syndrome (RR 2.67) 
• Subgroup analysis showed no statistically significant effect of calcium on the 
incidence of pre-eclampsia in women with adequate dietary calcium
LIMITATION OF 
RECOMMENDATION 
• Benefits are greatest in women with deficient dietary calcium 
• Is it relevant to our population? 
• Significance of the effect is influenced by pre-eclampsia risk status 
• Greatest benefits for women who are high risk for pre-eclampsia 
• Large studies were conducted in women at low risk and small trials were 
conducted in women at high risk 
• Conclusion 
• Although large studies on the use of calcium to prevent hypertensive disorders 
have been carried out, the variation in population and calcium status has made 
it impossible to reach a conclusion on the value of such treatment
OTHER INTERVENTIONS 
• Not recommended 
• Rest 
• Low salt diet 
• Exercise in pregnancy 
• Weight management in pregnancy 
• Other pharmaceutical agents (nitric oxide donors, progesterone, diuretics, 
LMWH) 
• Nutritional supplements (Mg, Folic acid, antioxidants, garlic)
THANK YOU 
ANY QUESTIONS?????

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Prevention of pre-eclampsia

  • 1. PREVENTION OF PREECLAMPSIA ROLE OF ASPIRIN AND CALCIUM Dr Kanddy O&G Updates Miri Hospital 1/11/14
  • 2. DEFINITIONS • Chronic hypertension • Hypertension (BP ≫ 140 90 mmHg; 4 – 6 hours apart); < 20 weeks of gestation • Gestational hypertension • Hypertension (BP ≫ 140 90 mmHg; 4 – 6 hours apart); > 20 weeks of gestation • Without significant proteinuria • Pre – eclampsia • Hypertension (BP ≫ 140 90 mmHg; 4 – 6 hours apart); > 20 weeks of gestation • With significant proteinuria – urine dipstick 2+ or more; or 24 hours urine protein 300 mg per day or more
  • 3. • Eclampsia • Seizure associated with pre-eclampsia • Chronic hypertension with superimposed pre-eclampsia • Unclassified hypertension • Hypertension (BP ≫ 140 90 mmHg; 4 – 6 hours apart); > 20 weeks of gestation but no BP record prior to that Based on ISSHP 2001 (International Society for Study of Hypertension in Pregnancy)
  • 5.
  • 6. BURDEN OF PRE-ECLAMPSIA • One of the major cause of maternal mortality
  • 8. • Fetal/neonatal morbidity/mortality • 1 in 20 (5%) stillbirths occurred in women with pre-eclampsia • 8 – 10% of all preterm birth result from hypertensive disorders • Small for gestational age
  • 9. REDUCING THE RISK OF HYPERTENSIVE DISORDERS IN PREGNANCY • Pre-existing risk factors • Modifiable • Obesity • Non-modifiable • Medical illnesses • Age • Primiparity • Family history
  • 10. ANTIPLATELET AGENTS • Rational • Pre-eclampsia is associated with deficient intravascular production of prostacyclin (a vasodilator) and excessive production of thromboxane – a vasoconstrictor and stimulant of platelet aggregation • Antiplatelet agents – might prevent or delay development of pre-eclampsia • Evidence • Before CLASP TRIAL • Small trials of antiplatelet therapy • Reduction of about three-quarters in the incidence of PE • Some avoidance of IUGR
  • 12. • Multicentre study • 9364 women – randomly assigned 60 mg aspirin or matching placebo • 74% entered for prophylaxis of pre-eclampsia • 12% for prophylaxis of IUGR • 3% for treatment of IUGR • Results • Use of aspirin was associated with a reduction of only 12% in the incidence of proteinuric pre-eclampsia (not significant) • No significant effect on the incidence of IUGR or stillbirth and neonatal death • Significantly reduce the likelihood of premature delivery (19.7% vs 22,2%; p=0.004)
  • 13. • Was not associated with a significant increase in placental haemorrhages or bleeding during epidural anaesthesia • Safe for the fetus and newborn infant • Conclusion • Do not support routine prophylactic or therapeutic administration of antiplatelet therapy in pregnancy to all women at increased risk of pre-eclampsia or IUGR • May be justified in women judged to be especially liable to early onset PE severe enough to need very preterm delivery
  • 14.
  • 15. • All randomised trials comparing antiplatelet agents with either placebo or no antiplatelet agent were included • To assess the effectiveness and safety of antiplatelet agents for women at risk of developing pre-eclampsia • Participants were pregnant women at risk of developing pre-eclampsia • Results • 59 trials (37,560 women) included • 17% reduction in the risk of pre-eclampsia associated with the use of antiplatelet agents; RR 0.83; NNT 72 Duley L, Henderson-Smart DJ, Meher S, King JF. Antiplatelet agents for preventing pre-eclampsia and its complications. Cochrane Database of Systemic Reviews 2007.
  • 16. • Significant increase in the absolute risk reduction of pre-elampsia for high risk compared with moderate risk women • 8% reduction in relative risk of preterm birth; NNT 72 • 14% reduction in fetal or neonatal death • 10% reduction in small-for-gestational age babies • Conclusion • Antiplatelet agents have moderate benefits when used for prevention of pre-eclampsia and its consequences Duley L, Henderson-Smart DJ, Meher S, King JF. Antiplatelet agents for preventing pre-eclampsia and its complications. Cochrane Database of Systemic Reviews 2007.
  • 17. RECOMMENDATION • Advice women at high of pre-eclampsia to take 75 mg of aspirin daily from 12 weeks until birth of baby • High risk factors (any one of the following) • Hypertensive disease during a previous pregnancy • Chronic kidney disease • Autoimmune disease such as SLE or antiphospholipid syndrome • Type 1 or 2 DM • Chronic hypertension NICE Clinical Guideline; Hypertension in Pregnancy; August 2010 (revised reprint January 2011)
  • 18. • Moderate risk (more than one of the following) • First pregnancy • Age 40 year-old • Pregnancy interval of more than 10 years • BMI of 35 or more at first visit • Family history of pre-eclampsia • Multiple pregnancy NICE Clinical Guideline; Hypertension in Pregnancy; August 2010 (revised reprint January 2011)
  • 20. • To assess the effects of calcium supplementation during pregnancy on hypertensive disorders of pregnancy and related maternal and child outcomes • Randomised trials comparing at least 1 g daily of calcium during pregnancy with placebos • Results • 13 studies; 15730 women • The average risk of high blood pressure was reduced with calcium supplementation (RR 0.65) • Reduction in the average risk of pre-eclampsia associated with calcium (RR 0.45)
  • 21. • Effect was greatest for women with low baseline calcium intake (RR 0.36) and those high risk • Risk of preterm birth reduced (RR 0.76) • Composite outcome maternal death or serious morbidity was reduced (RR 0.80) • No overall effect on the risk of stillbirth or death • Anomalous increase in the risk of HELLP syndrome (RR 2.67) • Subgroup analysis showed no statistically significant effect of calcium on the incidence of pre-eclampsia in women with adequate dietary calcium
  • 22. LIMITATION OF RECOMMENDATION • Benefits are greatest in women with deficient dietary calcium • Is it relevant to our population? • Significance of the effect is influenced by pre-eclampsia risk status • Greatest benefits for women who are high risk for pre-eclampsia • Large studies were conducted in women at low risk and small trials were conducted in women at high risk • Conclusion • Although large studies on the use of calcium to prevent hypertensive disorders have been carried out, the variation in population and calcium status has made it impossible to reach a conclusion on the value of such treatment
  • 23. OTHER INTERVENTIONS • Not recommended • Rest • Low salt diet • Exercise in pregnancy • Weight management in pregnancy • Other pharmaceutical agents (nitric oxide donors, progesterone, diuretics, LMWH) • Nutritional supplements (Mg, Folic acid, antioxidants, garlic)
  • 24. THANK YOU ANY QUESTIONS?????